<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>

    <style>


        

        .container{
            width: 100px;
            height: 100px;
            border: solid 1px red;
        }

         .item{
            width: 80px;
            height: 80px;
            background-color: skyblue;
            border: solid 1px skyblue;
        }

    </style>
</head>
<body>
    



    <div class="container">
        <div class="item"></div>
    </div>




</body>
</html>